The role of stratospheric ozone for Arctic-midlatitude linkages
The role of stratospheric ozone for Arctic-midlatitude linkages
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DOI：
10.1038/s41598-019-43823-1
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发表时间：
2019-05
影响因子：
4.6
通讯作者：
Erik Romanowsky;D. Handorf;Ralf Jaiser;I. Wohltmann;W. Dorn;J. Ukita;J. Cohen;K. Dethloff;M. Rex
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文献类型：
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作者：
Erik Romanowsky;D. Handorf;Ralf Jaiser;I. Wohltmann;W. Dorn;J. Ukita;J. Cohen;K. Dethloff;M. Rex
在过去的几十年里，北极变暖比中纬度地区更明显，使该地区成为气候变化的热点。与此相关的是，观察到海冰范围迅速缩小，海冰厚度减少。海冰的退缩使行星尺度大气波的向上传播增强，从而增加了热量和动量从海洋向上输送到对流层和平流层。在高层大气中，这些波存款的动量传输，扰乱平流层极涡，这可能导致这种流通的崩溃，也有可能显着影响对流层中，冬季末和早春。因此，气候模式中平流层过程的准确表示对于更好地理解海冰消退对大气环流的影响是必要的。通过模拟大气对规定的北极海冰下降的响应，我们表明，在大气模型计算中包括交互式平流层臭氧化学，与没有交互式化学的模拟相比，对流层-平流层相互作用得到了改善。这表明，平流层臭氧化学对于了解海冰对大气动力学的影响十分重要。
Arctic warming was more pronounced than warming in midlatitudes in the last decades making this region a hotspot of climate change. Associated with this, a rapid decline of sea-ice extent and a decrease of its thickness has been observed. Sea-ice retreat allows for an increased transport of heat and momentum from the ocean up to the tropo- and stratosphere by enhanced upward propagation of planetary-scale atmospheric waves. In the upper atmosphere, these waves deposit the momentum transported, disturbing the stratospheric polar vortex, which can lead to a breakdown of this circulation with the potential to also significantly impact the troposphere in mid- to late-winter and early spring. Therefore, an accurate representation of stratospheric processes in climate models is necessary to improve the understanding of the impact of retreating sea ice on the atmospheric circulation. By modeling the atmospheric response to a prescribed decline in Arctic sea ice, we show that including interactive stratospheric ozone chemistry in atmospheric model calculations leads to an improvement in tropo-stratospheric interactions compared to simulations without interactive chemistry. This suggests that stratospheric ozone chemistry is important for the understanding of sea ice related impacts on atmospheric dynamics.